Police received the triple-0 call just after 7.15pm, telling them there was a bomb at the Sydney Road factory.

The hoax call is the third one made in Bathurst in less than a week.

Police rushed to the factory and worked with management to evacuate all 30 people on shift while a search of the property and its surrounds got underway.

General duties police were joined by police rescue as they swept over the building, declaring the area safe three hours later.

Employees were able to return just after 11pm.

Chifley Local Area Command’s duty officer Inspector Chris Sammut said police were continuing their investigations into the incident.

“We are working to establish the identity of the caller and certainly investigations are underway to determine a person of interest,” he said.

While unable to put a monetary value on the cost of the operation, he said Devro had suffered a significant loss having been shut down and evacuated.

He said the fact the threat was made against a public facility meant the perpetrator would face a maximum penalty of 14 years’ jail time if caught.

“In the Crimes Act it comes under ‘Threaten Sabotage’ and carries a maximum sentence of 14 years, so it is certainly something that’s taken very seriously,” he said.

“Our aim is to find the person responsible for this and put them before the court.”

Emergency services were sent scrambling on Monday afternoon to attend two hoax triple-0 calls, both in lower William Street.

The first call said a four-year-old girl was seriously injured and the second call said a house was on fire.

The reported injuries to the child were so serious that six ambulance crews were dispatched to deal with the emergency. Police were also sent to the scene.

Investigations into Monday’s hoax calls are continuing.

Inspector Andrew Spliet said earlier in the week that police had various ways to track calls and identify the person responsible.

Ambulance Service of NSW inspector Rhys Dive, meanwhile, said hoax calls risked the lives of those having a real emergency.

Anyone with information on those responsible can contact Bathurst police or Crime Stoppers on 1800 333 000.